I've been battling this for a while on a thread and found out that since I'm a new user and there's a rule preventing SPAMming using URLs and images. That is understandable, however every message I enter with the word VS_NET (replace the underscore with a period) fails with this error message:

"The following errors occurred when this message was submitted:
Your Post contains one or more URLs or image calls, please remove them before submitting your message again. To prevent the abuse of spam, we have set this restriction in place until after you make 5 posts"

VS_NET (replace _ with .)

Not sure if it happens with any others, just figured you might want to know your LINK/IMAGE matching code is off.

It sees NET and that is your issue I am sorry to say. It does not happen a lot, but does once in a while. It really has cut down on the spam posts though so it is worth the risk for the occasional issue like this.